<style type="text/css">
  #draggable { width: 100px; height: 40px; padding: 0.5em; float: left; margin: 10px 10px 10px 0; }
  #droppable, #droppable2 { width: 230px; height: 120px; padding: 0.5em; float: left; margin: 10px; }
  #droppable-inner, #droppable2-inner { width: 170px; height: 60px; padding: 0.5em; float: left; margin: 10px; }
</style>

<div class="demo">
  
<div id="draggable" class="ui-widget-content">
  <p>Drag me to my target</p>
</div>

<div id="droppable" class="ui-widget-header">
  <p>Outer droppable</p>
  <div id="droppable-inner" class="ui-widget-header">
    <p>Inner droppable (not greedy)</p>
  </div>
</div>

<div id="droppable2" class="ui-widget-header">
  <p>Outer droppable</p>
  <div id="droppable2-inner" class="ui-widget-header">
    <p>Inner droppable (greedy)</p>
  </div>
</div>

</div><!-- End demo -->

<div class="demo-description">

<p>When working with nested droppables &#8212; for example, you may have an editable directory structure displayed as a tree, with folder and document nodes &#8212; the <code>greedy</code> option set to true prevents event propagation when a draggable is dropped on a child node (droppable).</p>

</div><!-- End demo-description -->